Intel B940 Datasheet Page 294

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Processor Configuration Registers
294 Datasheet, Volume 2
2.19.7 CL6—Cache Line Size Register
2.19.8 HDR6—Header Type Register
This register identifies the header layout of the configuration space. No physical
register exists at this location.
2.19.9 PBUSN6—Primary Bus Number Register
This register identifies that this "virtual" Host-PCI Express bridge is connected to PCI
bus 0.
B/D/F/Type: 0/6/0/PCI
Address Offset: Ch
Reset Value: 00h
Access: RW
Bit Attr
Reset
Value
Description
7:0 RW 00h
Cache Line Size (Scratch pad)
Implemented by PCI Express devices as a read-write field for legacy
compatibility purposes but has no impact on any PCI Express device
functionality.
B/D/F/Type: 0/6/0/PCI
Address Offset: Eh
Reset Value: 01h
Access: RO
Bit Attr
Reset
Value
Description
7:0 RO 01h
Header Type Register (HDR)
This field returns 01 to indicate that this is a single function device with
bridge header layout.
B/D/F/Type: 0/6/0/PCI
Address Offset: 18h
Reset Value: 00h
Access: RO
Bit Attr
Reset
Value
Description
7:0 RO 00h
Primary Bus Number (BUSN)
Configuration software typically programs this field with the number of the
bus on the primary side of the bridge. Since device 6 is an internal device
and its primary bus is always 0, these bits are read only and are hardwired to
0.
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